Roadster in Space

 "That which exercises reason is more excellent than that which does not exercise reason; there is nothing more excellent than the universe, therefore the universe exercises reason." - Zeno of Citium

Help Wanted

 "We are at the mercy of whoever wields authority over the things we either desire or detest.  If you would be free, then do not wish to have or avoid things that other people control, because then you must serve as their slave." - Epictetus

Rock Concert!

 "We ought to do good to others simply as a horse runs, or a bee makes honey, or a vine bears grapes season after season, without thinking of the grapes it has borne." - Marcus Aurelius

Molten Salt Reactors

 "It is more civilized to make fun of life than to bewail it." - Lucius Annaeus Seneca

N.S. Savannah

 "Death smiles at us all; all we can do is smile back." - Marcus Aurelius

Enrichment, burnable poison, and self-poisoning

 "Difficulty shows what men are.  Therefore when a difficulty falls upon you, remember that God, like a trainer of wrestlers, has matched you with a rough young man.  Why?  So that you may become an Olympic conqueror; but it is not accomplished without sweat." - Epictetus

Jefferson Mystery Clocks

 Be not disgusted, nor discouraged, if thou dost not succeed in doing everything according to right principles; but when thou hast failed, return back again, and be content if the greater part of what thou doest is consistent with man's nature, and love this to which thou returnest." - Marcus Aurelius

Shop Bathroom Water Heater

 "Confine yourself to the present" - Marcus Aurelius

Determining the charge of an electron

 "Take the shortest route, the one that nature planned - to speak and act in the healthiest way.  Do that, and be free of pain and stress, free of all calculation and pretension." - Marcus Aurelius

Mid-August

 "Freedom is the only worthy goal in life.  It is won by disregarding things that lie beyond our control" - Epictetus